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    <article id="post-wallFunctions1" class="article article-type-post" itemscope itemprop="blogPost">
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  <time datetime="2016-04-24T16:36:27.000Z" itemprop="datePublished">2016-04-25</time>
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      <a class="article-title" href="/2016/04/25/wallFunctions1/">OpenFOAM 中的壁面函数（一）</a>
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        <p>本系列来看看 OpenFOAM 中的壁面函数。壁面函数的本质，是边界条件。这里主要来看看壁面函数的基本原理，OpenFOAM 中实现了的壁面函数，以及选择壁面函数的一些参考依据。</p>
        
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    <article id="post-TurbulenceModel-30-macro" class="article article-type-post" itemscope itemprop="blogPost">
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  <time datetime="2016-04-24T16:11:08.000Z" itemprop="datePublished">2016-04-25</time>
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      <a class="article-title" href="/2016/04/25/TurbulenceModel-30-macro/">OpenFOAM-3.0 的湍流模型（四）</a>
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        <p>最后来看一个小问题：OpenFOAM-3.0 中的湍流模型是怎么编译的。在这之前，湍流模型的编译很直观，将需要编译的湍流模型的代码的 <code>.C</code> 文件写到 <code>Make/files</code> 里就好了。可是，在 OpenFOAM-3.0 里，很多湍流模型代码的 <code>.C</code> 文件并没有写到 <code>Make/files</code> 里，而是在 <code>makeTurbulenceModels.C</code>里类似这样写<br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="preprocessor">#<span class="keyword">include</span> "mykEpsilon.H"</span></span><br><span class="line">makeRASModel(mykEpsilon);</span><br></pre></td></tr></table></figure></p>
<p>然后在 <code>Make/files</code> 里写的是这个 <code>makeTurbulenceModels.C</code> 文件。为什么呢？</p>
<p>这里来分析一下这个问题。</p>
        
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    <article id="post-TurbulenceModel-30-NewModels" class="article article-type-post" itemscope itemprop="blogPost">
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    <a href="/2016/04/24/TurbulenceModel-30-NewModels/" class="article-date">
  <time datetime="2016-04-24T15:34:01.000Z" itemprop="datePublished">2016-04-24</time>
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    <h1 itemprop="name">
      <a class="article-title" href="/2016/04/24/TurbulenceModel-30-NewModels/">OpenFOAM-3.0 的湍流模型（三）</a>
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        <p>有了上一篇的基础，就很容易做到添加新的湍流模型了，这里分别给出对四类湍流模型增加新模型的方法。探索过程不详述了，仅给出结果。</p>
        
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    <article id="post-TurbulenceModel-30-RTS" class="article article-type-post" itemscope itemprop="blogPost">
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  <time datetime="2016-04-24T14:21:52.000Z" itemprop="datePublished">2016-04-24</time>
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    <h1 itemprop="name">
      <a class="article-title" href="/2016/04/24/TurbulenceModel-30-RTS/">OpenFOAM-3.0 的湍流模型（二）</a>
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        <p>本篇分析 OpenFOAM-3.0 中湍流模型的 RTS 机制。RTS 机制主要是通过调用几个相关的宏函数来实现的，所以，分析 RTS 机制需要将相关的宏函数展开。四类湍流模型，机制是类似的，这里以单相不可压缩湍流模型为例，后文会给出所有其他湍流模型相关的宏函数的展开结果，供读者参考。<br>RTS 机制的基础这里不再重复了，读者若对这里涉及到 RTS 机制的名称感兴趣，可以参考我以前对 RTS 机制的解读。</p>
        
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    <article id="post-TurbulenceModel-30-structure" class="article article-type-post" itemscope itemprop="blogPost">
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  <time datetime="2016-04-24T13:35:17.000Z" itemprop="datePublished">2016-04-24</time>
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    <h1 itemprop="name">
      <a class="article-title" href="/2016/04/24/TurbulenceModel-30-structure/">OpenFOAM-3.0 的湍流模型（一）</a>
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        <p>本系列分析 OpenFOAM-3.0 版本的湍流模型。从 3.0 版开始，OpenFOAM 中的湍流模型架构发生了较大的变化，其实这种变化在 2.3 版开始已经初露端倪，在 2.3 版里，多相流的湍流模型已经开始跟单相流湍流模型分开。从 3.0 开始，单相流湍流模型和多相流湍流模型统一到了一个架构下。本系列将对 3.0 版的湍流模型进行详细的分析，分为四部分：结构概览，RTS 机制分析，编译新模型的方法，以及一些补充说明。</p>
        
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    <article id="post-Boundary-conditions-in-OpenFOAM4" class="article article-type-post" itemscope itemprop="blogPost">
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    <a href="/2016/04/02/Boundary-conditions-in-OpenFOAM4/" class="article-date">
  <time datetime="2016-04-02T10:16:39.000Z" itemprop="datePublished">2016-04-02</time>
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      <a class="article-title" href="/2016/04/02/Boundary-conditions-in-OpenFOAM4/">OpenFOAM 中的边界条件（四）</a>
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        <h4 id="JohnsonJackson_边界条件">JohnsonJackson 边界条件</h4><p>本篇来看用于气固两相流模拟的 JohnsonJackson 边界条件。这组边界条件用于设定双流体模型中固相在壁面的速度和颗粒温度。根据 <a href="http://www.sciencedirect.com/science/article/pii/S0009250908003904">N. Reuge 2008, CES</a>，壁面上的固相速度和颗粒温度可以表示为：<br><img src="/image/boundaryConditions/JJ.png" alt="JohnsonJackson boundary conditions"><br>其中，$u_m$ 指的是 m 相在壁面切向上的滑移速度。<br>下面来看 OpenFOAM 中对这两个边界条件的实现</p>
        
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    <article id="post-Boundary-conditions-in-OpenFOAM3" class="article article-type-post" itemscope itemprop="blogPost">
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    <a href="/2016/04/02/Boundary-conditions-in-OpenFOAM3/" class="article-date">
  <time datetime="2016-04-02T09:29:16.000Z" itemprop="datePublished">2016-04-02</time>
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    <h1 itemprop="name">
      <a class="article-title" href="/2016/04/02/Boundary-conditions-in-OpenFOAM3/">OpenFOAM 中的边界条件（三）</a>
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        <p>OpenFOAM 中有很多复杂的边界都是继承自上篇中提到的三个基础边界条件，这些边界条件的代码在上一篇的基础上就很容易看懂了。只不过，还有一些边界条件，不是继承自这三个基础边界条件的，其中有一些都直接或间接继承自另一个重要的边界条件： <code>transformFvPatchField</code>。本篇来看看这个 <code>transformFvPatchField</code> 以及几个继承自它的边界条件。</p>
        
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    <article id="post-Boundary-conditions-in-OpenFOAM2" class="article article-type-post" itemscope itemprop="blogPost">
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  <time datetime="2016-04-02T08:40:43.000Z" itemprop="datePublished">2016-04-02</time>
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      <a class="article-title" href="/2016/04/02/Boundary-conditions-in-OpenFOAM2/">OpenFOAM 中的边界条件（二）</a>
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        <p>本篇在上一篇的基础上来解读 OpenFOAM 中的基础边界条件。基础边界条件一般包括三类，一是Dirichlet 边界，二是 Neumann 边界，三是混合 Dirichlet 和 Neumann 的边界。</p>
        
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    <article id="post-Boundary-conditions-in-OpenFOAM1" class="article article-type-post" itemscope itemprop="blogPost">
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    <a href="/2016/04/02/Boundary-conditions-in-OpenFOAM1/" class="article-date">
  <time datetime="2016-04-02T07:29:24.000Z" itemprop="datePublished">2016-04-02</time>
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      <a class="article-title" href="/2016/04/02/Boundary-conditions-in-OpenFOAM1/">OpenFOAM 中的边界条件（一）</a>
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        <p>本系列解读 OpenFOAM 中边界条件的实现。主要关心一些几个问题：</p>
<ol>
<li>OpenFOAM 中边界条件是怎样与有限体积离散部分交互的？</li>
<li>怎么从代码看懂一个边界条件具体是怎么计算边界上的值的？</li>
<li>怎么定制一个边界条件？</li>
</ol>
<p>本篇先阐述第一个问题。</p>
        
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    <article id="post-fvOptions2" class="article article-type-post" itemscope itemprop="blogPost">
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  <time datetime="2016-03-20T07:24:41.000Z" itemprop="datePublished">2016-03-20</time>
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      <a class="article-title" href="/2016/03/20/fvOptions2/">fvOptions 之 semiImplicitSource</a>
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        <p>上篇浅析了 fvOptions 框架的结构，这篇来看一个具体的源项类： <code>semiImplicitSource</code> 。</p>
        
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